11 Decommissioning; Shut-Down In The Event Of Dangerous Situations; Standstill For A Period <48 Hours; Measures During Shutdowns - GEA Grasso M-Series Operating Manual

Decommissioning

11 DECOMMISSIONING

11.1 Shut-down in the event of danger-
ous situations
The safety equipment of the screw compressor pack-
age complies with EN 378.
By means of automatic monitoring of the individual
operating parameters, the control unit detects haz-
ardous situations in good time and automatically
switches off the screw compressor package.
The cause of the fault is displayed on the control unit
and can then be corrected.
Among other things, the concept of the screw com-
pressor packages is based onlow maintenance
refrigerant circuits that are as well sealed as possi-
ble. However, residual risks remain, especially due
to possible leaks or escaping refrigerant or rotating
drive parts.
Hint!
The EMERGENCY STOP switch in the
switching cabinet is used to quickly
switch off the chiller whenever neces-
sary.
Leaking refrigerant can be detected with a gas
detector (not included in the scope of delivery). This
detector can be integrated in the automatic safety
chain.
Please consult the safety regulations in this docu-
mentation for information about what to do in the
case of leaking refrigerant.
11.2 Standstill for a period <48 hours
Hint!
The obligation to label the plant as
"Plant not in operation" must be
observed!
If the screw compressor package is shut down for a
period <48 hours, the following activities must be
performed:
1. Switch off the compressor in accordance with the
operating instructions for the electrical switch-
gear.
2. If necessary, shut down all ancillary drives.
84
3. Switch off the main switch of the three-phase
electric system.
4. If necessary, shut off the secondary refrigerant,
heating agent or the cooling water supply.
5. Ensure that the venting slots of the electric
motors are covered under all circumstances!
® Shut-down has been carried out
11.3 Standstill for a period >48 hours
Hint!
The obligation to label the plant as
"Plant not in operation" must be
observed!
If the screw compressor package is shut down for a
period >48 hours, the following activities must be
performed:
1. Switch off the compressor in accordance with the
operating instructions for the electrical switch-
gear.
2. Switch off all ancillary drives.
3. Switch off the main switch of the three-phase
electric system.
4. Close the stop valve (or combined stop/check
valves) on the suction side and the pressure
side.
5. Close the stop valves (or shuttable check valves)
in the suction line of the economiser.
6. Shut off the secondary refrigerant, heating agent
or cooling water.
7. Close the manual stop valve of the refrigerant
injection.
8. Ensure that the venting slots of the electric
motors are covered under all circumstances!
® Shut-down has been carried out
11.4

Measures during shutdowns

Even though the screw compressor package/ chiller
is under overpressure, check the moisture content of
the refrigerant and lubricating oil in case it is shut-
down for a period longer than half a year. The mois-
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
Operating Manual | GEA Grasso M-Series
Screw Compressor Packages